Compeession pump



(No Model.) 2 Sheets-Sheet 1.

GOMPRESSION PUMP.

No. 300,000. I Patented 000.7, 1884.

\ ,ln N I o n| N N- l i @L.. l I N N N o S E WTNESSES- lfm/ENTER- W@ ma M 2 sheetssheet 2.l

Patented 001;. '1, 1884. y

T. GOO-K.

GOMPRBSSION PUMP.

(No Model.)

lfm/ENTER WEE IINTTnn STATns Y PATENT O'nricn.

THOMAS COOK, OF COLUMBUS, MISSISSIPPI, ASSIGNOR OF ONE-HALF TO LEE M. TUCKER, OF SAME PLACE.

coMPREssloN-PUMP..

SPECIFICATION :forming part of Letters Patent No. 306,060, dated October 7, 1884-.

Application tiled November 8, 1883. (No model.)

seat at one end, and a valve which, being tted y in the sleeve so that it :maymove therein to a limited extent, is fixed to the piston-rod.

Another part of my invention consists of the combination of a valve-chest common to two pump-cylinders, two eduction-valves, and a single spring between said valves.

In order that my invention may be clearly understood, I have illustrated in the annexed drawings, and will proceed to describe, one form thereof.

Figure l is a side elevation of my improved ydouble-acting pump, showing-it as attached to a crank-engine for driving it. Fig. 2 is a plan view of the double-acting pump. Figs. 8 to 6 illustrate details of the pump.

The same letters of reference are used in all the figures in the designation of identical parts.

A'and B refer to the two pump-cylinders, arranged in the same axial line and separated by the valve-chest C, which is common to both, and constructed with two heads containing each a valve-seat, c, as shown in Fig. 4. Each pump-cylinder contains a piston composed of a sleeve, D, and a valve, E. The valve E,

which is the induction-valve of the pump, is in the form of a solid plug fitting snugly in the sleeve, and provided at one end with a valvey face, e, adapted to the valve-seat d, formed in one end of the sleeve D. Spiral grooves e are cut or formed in the body of the valve for the passage of the gas. Vhen seated, the end of the valve-face is flush with the end ofthe sleeve D, as shown in Fig. 3. In opening the valve its movement in the sleeve D is limited by a `split ring, dQsprung into a groove in the sleeve D. The v alve E is secured to the piston-rod F. The pistons of the two pump-cylinders are precisely alike, but arranged reversely. The piston-rod F of pump-cylinder B is secured to a cross-head, G, while the piston-rod F of the pump-cylinder A is secured to a cross-head, H. The cross-heads G and H are connected together by parallel rods I I, outside of the pump-cylinders, and supported in fixed guides I, which may be formed on the pump-cylinders, as shown.

The eduction-valves K and L, constructed substantially as the induction-valve E-namely, with a valve-face and a spirally-grooved body-arc arranged in suitable sleeve-guides on the valve-chest directly opposite each other, so that a single spring, M, may be used for seating them. The gas to be compressed enters pump-cylinder A through pipe a and pumpcylinder B through pipe b. These pipes a b may be connected to a common inductionpipe. The compressed gas passes from the valve-chest to a suitable condenser through a pipe, C. 1

For the purpose of lubricating all the moving parts of the pump, I mount a lubricator, N, on the stutng-box of each pump-cylinder, between the packing and the head of the cylinder, as shown in Fig. 5. Piston-rod F is providedwith a groove, f, which at each outstroke passes just beyond the lubricator-duct in the stuffing-box, so as to take a little lubri-` cant into the pump-cylinder at each instroke. The lubricant thus introduced will gradually work its way into the valve-chest C, which acts as a trap, and from which the spent lubricant may be drawn ott from time to time through the waste-pipe c. I prefer to arrange this double-acting pump horizontally and to drive it by a horizontal crank-engine, as shown in Fig. l, the elongated rearwardly-proj ectin g piston-rod of the engine being secured to the cross-head H of the pump.

In the operation of this double-acting pump the gas is compressed alternately in the respective pump-cylinders. At the beginning of the instroke the valve E moves in the seat until it seats itself, from which time it pushes the sleeve D along with it to the end of the instroke. At the beginning of theoutstroke the valve E rst unseats itself by moving in,

ICO

the sleeve D, and then drags the sleeve along with it, remaining,` open to the termination of the outstroke. I prefer to eonne the valve E in the sleeve by a split ring;7 because it dispenses with screws or other devices, which are liable to work loose and damage the pump. It will be observed that by Constructing this double-acting` pump in the manner described the stuffing-boxes are subjected to low pressure only, which is an important desideratum, because the stuffing-boxes can be kept tight Without putting` too much friction on the pis-l ton-rods by the packing; also, that only a single valve-chest for the @duction-valves is required.

My improved piston may be used in vacuum-pumps and lift and force pumps as well as in eompressingpulnps.

I Claim as my inventionl. A pump-piston composed of a sleeve pro- 2o vided with a valve-seat, and a valve secured to the piston-rod and fitted to move to a liniited extent in the said sleeve.

2. A pump-piston composed of a sleeve, a valve fitted therein7 and a split ring for con- 25 ning the valve in the sleeve.

3. rlhe Combination, substantially as before -set forth, of the valveohest, the two eduotionvalves, and the spring between the valves.

In testimony whereof I affix my signature in 3o presence of two witnesses.

THOMAS COOK.

Titnessesz G. A. NEALE, E. T. VALKER. 

